Measurement aided Doherty amplifier

Doherty amplifier development

Doherty amplifier architecture enables RF PA designers to maximize efficiency, power, bandwidth and yield without compromising linearizability

Whether it is for 5G, SatCom or any other application demanding high performance and reproducibility, the challenges remain the same: how can you be sure that you are getting the maximum possible performance from the design and how can you evaluate its sensitivities and variations for series production?

Running a test campaign while changing the drive signals in the two doherty paths enables complete amplifier design characterization. The R&S®SMW200A vector signal generator outputs two signals whose relative linear (amplitude and phase) or non-linear (e.g. shaped) characteristics are varied with precision.

The R&S®FSW signal and spectrum analyzer not only returns scalar quantities such as spectral regrowth and EVM, but also AM/AM and AM/PM, gain and peak envelope power (using the R&S®FSW-K18 option).

Optimizing the Perennial Doherty Power Amplifier

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Optimizing the Perennial Doherty Power Amplifier

Many power amplifier variations have aimed to improve amplifier performance linearization and energy efficiency. This paper, originally printed in the Microwave Journal, outlines the methods used, then concentrates on Doherty amplifier implementations, describing the challenges and possible ways to improve the performance.

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Application guide: Measurement-aided Doherty amplifier design

Targeting those responsible for Doherty Amplifier development, this document summarizes some of the technical challenges, limitations, implementations, and introduces a design methodology that enables maximized cost-performance to be achieved.

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Application note: R&S®SMW-K546 Digital Doherty

The R&S®SMW-K546 software option aids the optimum design of multiple path amplifiers, including Doherty Amplifiers.

This application note provides guidance on the use of the software option, both for direct control and programming via the touchscreen, and for remote control using SCPI.

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White paper: Making effective use of Doherty architecture

5G technology evolution drives the demand for efficient power amplifier implementations to achieve high-density setups. Imagine you could get 60 % more output power, 50 % more bandwith and up to 20 % efficiency gain per amplifier in a MIMO antenna array setup?

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Application card: Optimize Doherty power amplifiers

Speed up development, verify best performance and start up series production with confidence. Get deep insight into your Doherty amplifier design with a dual-path, precisely synchronized source driving the Doherty amplifier and improve your yield.

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Related webinars

Webinar: The dual input Doherty

Overcome design challenges such as optimum signal alignment, and PA class, by driving with linear and non-linear input signals. Measurements on a state-of-the-art GaN Doherty Amplifier, enabled by unique signal generation and analysis solutions, illustrate the approach.

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Webinar: Doherty amplifier - measurement-aided development

Understand how the 2 paths of the Doherty work best in concert. Measurement aided design with dedicated a Doherty application in T&M gives you easy access to the data you need.

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R&S®SMW200A vector signal generator

The R&S®SMW200A is the perfect tool for generating high-quality, complex, digitally modulated signals. The R&S®SMW is one of a broad portfolio of signal generators offering wide frequency ranges.

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R&S®FSW signal and spectrum analyzer

The high-performance R&S®FSW signal and spectrum analyzer was developed to meet demanding customer requirements. Offering low phase noise, wide analysis bandwidth and straightforward and intuitive operation, the analyzer makes measurements fast and easy.

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